can you resize that using qtparted?
Yes I believe so, although I have never tried it.

60 gigs
How much space is being used of that 60?

Do you have a home directory for every distribution, or a single home directory used by all distributions? If you're planning on having millions of distributions on the same box, it is a good idea to have an extra partition for your home directory.

By tha way, make sure your partitions(/usr and all that) are taggged for auto in fstab, otherwise you may have a few unexpected surprises.